语码转换是指语言使用者在同一语篇中交替使用两种或两种以上语码的语言现象。语码转换不仅经常出现在日常生活中,而且在文学作品中也较为常见。其中在钱钟书先生的《围城》中,鉴于各种原因,小说中人物在他们的对话中经常使用语码转换。因此,本文以《围城》为语料,以JefVerschueren的顺应论为理论基础,寻找可以导致这些语码转换发生的因素,以及这些语码转换所具有的语用功能。 Code-switching refers to the phenomenon that language users alternately use two or more codes in the same discourse. Code-switching is not only common in daily life, but also in literary works. Among them, in Mr. Qian’s book Fortress Besieged, characters in the novel often use code-switching in their dialogues for various reasons. Therefore, based on Jef Verschueren’s Adaptation Theory, this thesis takes “Fortress Besieged” as the corpus and seeks for the factors that can lead to these code conversion and the pragmatic functions of these code conversion.